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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

 Copyright (C) 2009 Klaus Spanderen

 This file is part of QuantLib, a free-software/open-source library
 for financial quantitative analysts and developers - http://quantlib.org/

 QuantLib is free software: you can redistribute it and/or modify it
 under the terms of the QuantLib license.  You should have received a
 copy of the license along with this program; if not, please email
 <quantlib-dev@lists.sf.net>. The license is also available online at

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the license for more details.

/*! \file fdmhestonhullwhitesolver.hpp

#ifndef quantlib_fdm_heston_hull_white_solver_hpp
#define quantlib_fdm_heston_hull_white_solver_hpp

#include <ql/handle.hpp>
#include <ql/patterns/lazyobject.hpp>
#include <ql/processes/hestonprocess.hpp>
#include <ql/processes/hullwhiteprocess.hpp>
#include <ql/experimental/finitedifferences/fdmbackwardsolver.hpp>
#include <ql/experimental/finitedifferences/fdmdirichletboundary.hpp>

namespace QuantLib {

    class FdmMesher;
    class FdmInnerValueCalculator;
    class FdmSnapshotCondition;
    class FdmStepConditionComposite;
    class BicubicSpline;

    class FdmHestonHullWhiteSolver : public LazyObject {
            const Handle<HestonProcess>& hestonProcess,
            const Handle<HullWhiteProcess>& hwProcess,
            Rate corrEquityShortRate,
            const boost::shared_ptr<FdmMesher>& mesher,
            const FdmBoundaryConditionSet& bcSet,
            const boost::shared_ptr<FdmStepConditionComposite> & condition,
            const boost::shared_ptr<FdmInnerValueCalculator>& calculator,
            Time maturity,
            Size timeSteps,
            Size dampingSteps = 0,
            FdmBackwardSolver::FdmSchemeType type 
                                    = FdmBackwardSolver::Hundsdorfer,
            Real theta = 0.5+std::sqrt(3.0)/6,
            Real mu = 0.5);

        Real valueAt(Real s, Real v, Rate r) const;
        Real thetaAt(Real s, Real v, Rate r) const;
        // First and second order derivative with respect to S_t. 
        // Please note that this is not the "model implied" delta or gamma.
        // E.g. see Fabio Mercurio, Massimo Morini 
        // "A Note on Hedging with Local and Stochastic Volatility Models",
        // http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1294284  
        Real deltaAt(Real s, Real v, Rate r, Real eps) const;
        Real gammaAt(Real s, Real v, Rate r, Real eps) const;
        void performCalculations() const;

        const Handle<HestonProcess> hestonProcess_;  
        const Handle<HullWhiteProcess> hwProcess_;
        const Real corrEquityShortRate_;
        const boost::shared_ptr<FdmMesher> mesher_;
        const FdmBoundaryConditionSet bcSet_;
        const boost::shared_ptr<FdmSnapshotCondition> thetaCondition_;
        const boost::shared_ptr<FdmStepConditionComposite> condition_;
        const Time maturity_;
        const Size timeSteps_;
        const Size dampingSteps_;

        const FdmBackwardSolver::FdmSchemeType schemeType_;
        const Real theta_, mu_;

        std::vector<Real> x_, v_, r_, initialValues_;
        mutable std::vector<Matrix> resultValues_;
        mutable std::vector<boost::shared_ptr<BicubicSpline> > interpolation_;


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